As title mentioned, I thought it id hard to find strongest backlinks because it is not easy to track which backlink has influenced the SERP rankings the most and the backlinks depend on more factors like site history, backlinks from content, hard backlinks or authority sites...etc

But I am wondering, from your experience where are sources for best backlinks? If you know, please share a bit of your experience and explaining why it worked and why its the best?

The strongest backlink is content building and promoting with a backlink to your website. Contents are important factors to help rank your website higher in search engines. Promoting content in various blogs and submission websites help to improve keyword ranking and also build good traffic from them.

As for me, thanks for backlinks you will have a rank high! I want to share with this benefits!1. Increase search engine rankings2. Traffic generation3. Generate sales and/or subscribers4. Become recognized as an authority in your nicheAlso, nature backlinks are very important and can increase your traffic!